Formation of Body Serous Cavities

Question 1

How would you summarize serous cavity formation?

Answer 1

all cavities develop from a common coelom

individual cavites are formed by inward growth of tissue folds - partitions

individual cavites are formed by outward growth of coelomic cavity - excavation

Question 2

What initially separates the pericardial and pleural cavities?

Answer 2

the pleuropericardial folds

Question 3

Why do the pleural and pericardial cavities communicate in the embryo?

Answer 3

Because the cavities are not fully separated yet - they communicate through canals

Question 4

What eventually separates the pericardial and pleural cavities in the adult?

Answer 4

fibrous pericardium

Question 5

what is the adult peritoneal and pleural cavity separated by?

Answer 5

the diaphragm

Question 6

What is the diaphragm formed by?

Answer 6

septum transversum

paired pleuroperitoneal folds

somatic mesoderm

Question 7

What’s the order for diaphragm formation?

Answer 7

septum transversum to pleuroperitoneal folds to pleural cavities to somatic mesoderm to diaphragm